/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/***********************************************************************
 * examples/kernel_sample/posixtimer.c
 *
 *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ***********************************************************************/

/**************************************************************************
 * Included Files
 **************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <semaphore.h>
#include <signal.h>
#include <sched.h>
#include <errno.h>
#include "kernel_sample.h"

/**************************************************************************
 * Private Definitions
 **************************************************************************/

#ifndef NULL
# define NULL (void*)0
#endif

#define MY_TIMER_SIGNAL 17
#define SIGVALUE_INT  42

/**************************************************************************
 * Private Data
 **************************************************************************/

static sem_t sem;
static int g_nsigreceived = 0;

/**************************************************************************
 * Private Functions
 **************************************************************************/

static void timer_expiration(int signo, siginfo_t *info, void *ucontext)
{
	sigset_t oldset;
	sigset_t allsigs;
	int status;

	printf("timer_expiration: Received signal %d\n" , signo);

	g_nsigreceived++;

	/* Check signo */

	if (signo != MY_TIMER_SIGNAL) {
		printf("timer_expiration: ERROR expected signo=%d\n" , MY_TIMER_SIGNAL);
	}

	/* Check siginfo */

	if (info->si_value.sival_int != SIGVALUE_INT) {
		printf("timer_expiration: ERROR sival_int=%d expected %d\n",
			   info->si_value.sival_int, SIGVALUE_INT);
	} else {
		printf("timer_expiration: sival_int=%d\n" , info->si_value.sival_int);
	}

	if (info->si_signo != MY_TIMER_SIGNAL) {
		printf("timer_expiration: ERROR expected si_signo=%d, got=%d\n",
			   MY_TIMER_SIGNAL, info->si_signo);
	}

	if (info->si_code == SI_TIMER) {
		printf("timer_expiration: si_code=%d (SI_TIMER)\n" , info->si_code);
	} else {
		printf("timer_expiration: ERROR si_code=%d, expected SI_TIMER=%d\n",
			   info->si_code, SI_TIMER);
	}

	/* Check ucontext_t */

	printf("timer_expiration: ucontext=%p\n" , ucontext);

	/* Check sigprocmask */

	(void)sigfillset(&allsigs);
	status = sigprocmask(SIG_SETMASK, NULL, &oldset);
	if (status != OK) {
		printf("timer_expiration: ERROR sigprocmask failed, status=%d\n",
			   status);
	}

	if (oldset != allsigs) {
		printf("timer_expiration: ERROR sigprocmask=%x expected=%x\n",
			   oldset, allsigs);
	}

}

/**************************************************************************
 * Public Functions
 **************************************************************************/

void timer_test(void)
{
	sigset_t           sigset;
	struct sigaction   act;
	struct sigaction   oact;
	struct sigevent    notify;
	struct itimerspec  timer;
	timer_t            timerid;
	int                status;
	int                i;

	printf("timer_test: Initializing semaphore to 0\n");
	sem_init(&sem, 0, 0);

	/* Start waiter thread  */

	printf("timer_test: Unmasking signal %d\n" , MY_TIMER_SIGNAL);

	(void)sigemptyset(&sigset);
	(void)sigaddset(&sigset, MY_TIMER_SIGNAL);
	status = sigprocmask(SIG_UNBLOCK, &sigset, NULL);
	if (status != OK) {
		printf("timer_test: ERROR sigprocmask failed, status=%d\n",
			   status);
	}

	printf("timer_test: Registering signal handler\n");
	act.sa_sigaction = timer_expiration;
	act.sa_flags  = SA_SIGINFO;

	(void)sigfillset(&act.sa_mask);
	(void)sigdelset(&act.sa_mask, MY_TIMER_SIGNAL);

	status = sigaction(MY_TIMER_SIGNAL, &act, &oact);
	if (status != OK) {
		printf("timer_test: ERROR sigaction failed, status=%d\n" , status);
	}

#ifndef SDCC
	printf("timer_test: oact.sigaction=%p oact.sa_flags=%x oact.sa_mask=%x\n",
		   oact.sa_sigaction, oact.sa_flags, oact.sa_mask);
#endif

	/* Create the POSIX timer */

	printf("timer_test: Creating timer\n");

	notify.sigev_notify          = SIGEV_SIGNAL;
	notify.sigev_signo           = MY_TIMER_SIGNAL;
	notify.sigev_value.sival_int = SIGVALUE_INT;

	status = timer_create(CLOCK_REALTIME, &notify, &timerid);
	if (status != OK) {
		printf("timer_test: timer_create failed, errno=%d\n", errno);
		goto errorout;
	}

	/* Start the POSIX timer */

	printf("timer_test: Starting timer\n");

	timer.it_value.tv_sec     = 2;
	timer.it_value.tv_nsec    = 0;
	timer.it_interval.tv_sec  = 2;
	timer.it_interval.tv_nsec = 0;

	status = timer_settime(timerid, 0, &timer, NULL);
	if (status != OK) {
		printf("timer_test: timer_settime failed, errno=%d\n", errno);
		goto errorout;
	}

	/* Take the semaphore */

	for (i = 0; i < 5; i++) {
		printf("timer_test: Waiting on semaphore\n");
		FFLUSH();
		status = sem_wait(&sem);
		if (status != 0) {
			int error = errno;
			if (error == EINTR) {
				printf("timer_test: sem_wait() successfully interrupted by signal\n");
			} else {
				printf("timer_test: ERROR sem_wait failed, errno=%d\n" , error);
			}
		} else {
			printf("timer_test: ERROR awakened with no error!\n");
		}
		printf("timer_test: g_nsigreceived=%d\n", g_nsigreceived);
	}

errorout:
	sem_destroy(&sem);

	/* Then delete the timer */

	printf("timer_test: Deleting timer\n");
	status = timer_delete(timerid);
	if (status != OK) {
		printf("timer_test: timer_create failed, errno=%d\n", errno);
	}

	/* Detach the signal handler */

	act.sa_sigaction = SIG_DFL;
	status = sigaction(MY_TIMER_SIGNAL, &act, &oact);

	printf("timer_test: done\n");
	FFLUSH();
}
